Chimney-valve for hot-blast stoves.



No. 69l,476. Patented Ian. 2|, |902.v

T. MURBISUN. GHIMNEY VALVE FUR HOT BLAST STOVES.

(Application led Jan. l5L 1901.)

(No Model.)

UNITED STATES PATENT OFFICE.

THOMAS MORRISON, OF -BRADDOOIQ PENNSYLVANIA.

CHllVlNEYr-VALVE FOR HOT-BLAST STOVES.

SPECIFICATION forming part 0f Letters Patent No. 691 ,47 6, dated January 21, 1902.

Application filed January 15, 1901. Serial No. 43,358. (No model.) y

To all zz/wmt'z may concern.:

Be it known that I, THOMAS MORRISON, o-f Braddock, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Chimney-Valve for Hot-Blast Stoves, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in Which- Figurell is a horizontalv section of a hotblast stove, showing one of my improved valves in horizontal section and another in plan, both valves being open. Fig. 2 is a vertical central section, on a larger scale, showing one of the valves in closed position.

Heretofore lthe chimney-valves of hot-blast stoves have generally been constructed either as sliding gate-valves or as water-cooled mushroom-valves operated by stems which extend vertically to the outside ofthe valve-casing; but by reason of the dust which comes out from the stove and the grease and moisture which are carried in by the cold blast the seats of such valves are apt to become clogged and to cause the valves to tit unevenly, thereby occasioning leaks, which when the cold blast enters the stove permits a portion of it to escape Wastefully into the stack. Such valves are also dicult of access. The leak is hard to detect and hard to stop. It is the purpose of my invention to correct these evils and also to cause the stove to act more uniformly by employing two or more chimneyvalves and outlets at different parts of the periphery of the stove.

My invention consists in employing at the stack-outlet of the stove a disconnect-ed chimney-valve comprising a hollow or tubular section which when it is in its open position tits the outlet-port of the stove and communicates with the chimney-flue and which is provided with a plate so constructed that when it is drawn back to open the outlet-port of the stove it will move over and close the port of the flue. When the valve is thus disconnected from the stove, the outlet port is tightly closed by a suitable door.

In the drawings, 2 represents the shell of the hot-blast stove, having an outlet-port 3 for the exit of the hot gases on their way to the chimney. f

.a tight joint.

its open position when the ports 7 and 4 are in register its end enters and fits the stoveport 3, so that the hot ,gases from the stove will pass directly through the valve and into the chimney-flue. When the valve is to be closed, it is drawn back so as to shut the opening 4; and to expose the port 3, whereupon a door 10, suitably shaped to fit this port neatly,

is applied to it and fastened so as to make The door is exposed to view, and any leakage which may occur when it is closed can readily be perceived and corrected. The importance of this in the working of the stove will be appreciated by those who are skilled in the art.

The invention enables me to dispense with the valve heretofore used in the chimneyiiue, leaving in the stove only one valve which is apt to leak-namely, the rhot-blast' valve. It also enables me to regulate the draft on the stove when desired by drawing back the valve somewhat, whereby the port Ll maybe partly closed and an opening for air afforded at the end of the valve, both of which will have the effect of lessening the draft.

The simplicity of construction of my valves enables me with economy to employ two or more of them, as shown at A B in Fig. l, arranged at dierent parts of the circumference of the stove, so that the draft from the stove is distributed and is not localized at a single point, as is the case where only one valve and outlet-flue are employed.

I claim- 1. A hot-blast stove having an outlet-port, a chimney-flue, an elevated box 5 connected with the chimney-flue, and a hollow chimneyvalve adapted to fit the outlet-port of the stove and mounted on the said box, said valve being movable on the box to and from the outlet-port, and having a portion which in its IOO 1o the ports of the chimney-lines, said outletports being situate at different parts of the periphery of the stove and being adapted thereby to distribute and equalize the draft on the stove; substantially as described.

In testimony whereof I have hereunto set I5 myhand.

THOMAS MORRISON.

Witnesses:

H. M. CORWIN, THOMAS W. BAKEWELL. 

